Complete Thai and English translations across the UI

tests/i18n-coverage.test.cjs

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+const test = require('node:test');
+const assert = require('node:assert/strict');
+const fs = require('node:fs');
+const path = require('node:path');
+const { pathToFileURL } = require('node:url');
+
+const root = path.join(__dirname, '..');
+const html = fs.readFileSync(path.join(root, 'index.html'), 'utf8');
+
+function resolve(dict, key) {
+  if (typeof dict[key] === 'string') return dict[key];
+  if (key.includes('.')) return key.split('.').reduce((value, part) => value?.[part], dict);
+  return undefined;
+}
+
+test('every data-i18n key in index.html exists in Thai and English', async () => {
+  const { TRANSLATIONS } = await import(pathToFileURL(path.join(root, 'js/i18n.js')).href);
+  const keys = new Set();
+  const attrRe = /data-i18n(?:-placeholder|-title|-alt|-aria-label)?="([^"]+)"/g;
+  let match;
+  while ((match = attrRe.exec(html))) keys.add(match[1].trim());
+
+  assert.ok(keys.size > 300, 'index.html should expose a large translation surface');
+
+  for (const lang of ['th', 'en']) {
+    const missing = [...keys].filter((key) => {
+      const value = resolve(TRANSLATIONS[lang], key);
+      return typeof value !== 'string' || !value.trim();
+    });
+    assert.deepEqual(missing, [], `${lang} is missing data-i18n keys: ${missing.join(', ')}`);
+  }
+});
+
+test('nested element and path dictionaries stay addressable from HTML', async () => {
+  const { TRANSLATIONS } = await import(pathToFileURL(path.join(root, 'js/i18n.js')).href);
+  for (const lang of ['th', 'en']) {
+    for (const key of ['elements.Fire', 'elements.Ice', 'elements.Imaginary', 'paths.Destruction', 'paths.Elation']) {
+      const value = resolve(TRANSLATIONS[lang], key);
+      assert.equal(typeof value, 'string', `${lang}.${key} must resolve`);
+      assert.ok(value.trim().length > 0, `${lang}.${key} must not be empty`);
+    }
+  }
+  assert.equal(html.includes('data-i18n="Fire"'), false);
+  assert.equal(html.includes('data-i18n="elements.Fire"'), true);
+});
+
+test('the shared theory-craft hint is translated', async () => {
+  const { TRANSLATIONS } = await import(pathToFileURL(path.join(root, 'js/i18n.js')).href);
+  for (const lang of ['th', 'en']) {
+    assert.equal(typeof TRANSLATIONS[lang].fireflyTheoryModeHint, 'string');
+    assert.ok(TRANSLATIONS[lang].fireflyTheoryModeHint.trim().length > 0);
+  }
+});